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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '511cd89b51f5c13cae6777ee77a8ea3821de62f0dff2990052ea0cda99700004' 
  AND token = '9hUpe4CAQlsxrEfuEgXclFFRh9s2InAR1Gf2YrENS6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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