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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6935daff01260b68517142016a5c8c84cd4860800e940053abf2df34eb30db3' 
  AND token = 'ity6NyQCCkXy2+Bhi1lTzikM/ljSx7MJX2wmOiofwPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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