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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3437917c4b3da52d8d2a6af353ba35a041689e170c7c01ffe42fa8eb7f9e51d8' 
  AND token = 'ZJp7WbPu9Vec4bHeEMGYek1i9XqTL1H/LREI5q7m29M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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