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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e445f7eb29bb6bd0519764c83d2fbf539349a9c940bdaf7e8ed9de23a2803d0' 
  AND token = 'q0X8CHb9EtFRo1SMSUwyu2I415Tqxl2EL2jeD2g0rCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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