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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '688149164c8047d5d8f54e84f9c4df5f684958c084f195550a74e39bbfc2ef2f' 
  AND token = 'g7P5221IuauQSHT7MN2djxPRs/Rq0KXnt20uyai1Cdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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