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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb3af4cca9a9c1bc7a4f7a0b1272bc17249edd303ed4607afb8aa3d43525dc52' 
  AND token = 'Mx2Rlsun4yBHmGN3BmKmwtRKLUy/j8q8cUdeBqiK+5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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