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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8653644c375cea3fe36e5a51d930f17daf532938d792d67aa8768b8fa7b81d9' 
  AND token = '/jZnlQqBEJ1U47dQAO4dyvxUL6ngIyHje5BOKlpKagk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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