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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a13c5b91e8ffca3eba9a0d6ad2983d250d8008cdb1ed28ce759afb037264367' 
  AND token = '3LZPSj7nFWmZbRCGwf3i2EveHi+6kkubQRHeR2H6hHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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