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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd2c6340f9bee8717b5ffb790531c82acbe0d4100f0b9c9ab8941c109821d363' 
  AND token = '0oqxwCNMJUK08tdYcVLMkrD5HhGf+VzZ5wzDmdIXh20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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