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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2781e99d0f02a796a1bbd0c0fcf26ce8689d31ee54bb2b365ab23f494240aadf' 
  AND token = '6GCvbcvQ4k5i8SF9ENKQs5ZmU8uZNjWPMVBB/iOTBvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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