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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e50d07464ccef0ee94c4bc25cfdee3a172b5faad1827e6442a824dfe88d4adab' 
  AND token = 'A8fujTtZeFlanxk6LoqM9QbBLEGMKtfjsCdt5L0hJTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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