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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6095176b6ada2a0911f8d43e1d634840b6a1ca150f31c0b0ea39b89f395bc5d' 
  AND token = 'TEyFMRcG6fB491Rs/iIfKYB1dTnJYT5CBYG7djiEQZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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