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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6920c6a9bb3519eed405004af3c46bc35494375c194f34bb5545e28bb0c23d34' 
  AND token = 'U5ZveKaXZbeeRqrQqBxsL6XCaE7wUZDg1IRj0lI7WIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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