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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b2729a737f47d0738fb1e914ecf8ff85034540fba75c748942ce88f3474ff3e' 
  AND token = 'SKhJan5JBaluQHuc+ZdI1I9GJwZbfALV/viQNif9V7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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