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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5139f5695be8cea49336bb371d6dcf13a20f7c57b3f8a40d652615cc96298491' 
  AND token = 'vvHdtqAFYpJf99T9gMgN0Lk7LXdd2Gp7/pNknABk9iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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