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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b1db769556d5871a6c838f5dff14053d22750187dcfda9f149c1417817bda02' 
  AND token = 'QdwfvaUgn7JM67i5WcO/L/Cd9skyHiDOdd/4VBvRidw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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