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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be26e50be2eb023b6235fd06b05c31b13d944622c950a0859f1cdbecbd9e65aa' 
  AND token = 'k8mdRs3pz14Dp0K3JFsDgDkY8WVTwCkFuQ67pFH4XCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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