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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc8e479ccc2b4401ed49caa87cff73b2881e20c7e76deb51ef9f44bc57073db1' 
  AND token = 'joH93u9z6Gja69B5XaojB7qfIRbPeiar3e1twbZ5rw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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