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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dde3ad8c486ed23a57d3196a31eb6c0b352c59ad4ac33d3474d735a6f782be9e' 
  AND token = 'Ol6UDD1KacyHhXLNT7AgvXcWU8xmAKG0r1GNGVHC6js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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