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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d455048bbb492ef6efc8cc1734b8a1fbadce444118c33a7fd8d88293af2ef51' 
  AND token = '7TDTN8dqe3A4u/HVCZFGvwi4bM1d4TJuRemh4J+vBvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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