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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fee3962f9a6febaafe261b7bdda01f5dbe10730083563ca62efb19f15cef1dc' 
  AND token = '+8pM0AydKIfkjQNj6BOSHLn+I/DpvljDhh76g6ye858=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}