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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f623098644bf2c02109375b8c39dd60ea59b5eb62e54e0c692fbb68e2f09089' 
  AND token = 'BY3n1lPX9apigDz3B/Odn0N/K/ZixFKaOouu6brvtfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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