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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0538dfbb41d99183997eb041b0ea7e0387eb719cea648fc5b3fbf45a930f551' 
  AND token = 'YYelEAhYzQ951RJDXTL2d9sTjMbZ4zz2KgxwwJzY6hY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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