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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fcbe7124b9326589a170d86811af271f4741391638b7e04087b1f0a17812236' 
  AND token = 'ZfDSVeTv/s4f4RTCVXL5hoxhNphgpqf1jDued+32NKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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