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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71512028d45a7e4feb2d5473d5d9b6e9eddfc8ccc614a3d2b0e95d50b7c2925a' 
  AND token = 'dCID8AxzUk0mgtcXXB9jd50ytkovQHgiOi0hud2pj9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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