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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1f3d6909e2962508d979429f8c3b4e0e4d96e210c9071a84509aa91ecfa5e64' 
  AND token = 'z72nf/Zkx7N4WLZs78Ds5GE/rXIunaVrrn5q3rV5V2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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