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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a653de33d7a3d5f17a5503ab9f1794b3ca55a7a3eea0972ef5b52a95059e7c99' 
  AND token = 'Rt6doqRgt5gbEQboy4z/eEnz1VQ8AHVZiIYR3fYdewo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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