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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6bc9d5449a0b266d015af72d4cfacf963c6e8c8590602321c94be4a5f190985' 
  AND token = 'atlh9hHBxmr3vG7glQ8t5FudO7QFw2cFzcwPu2TfkOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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