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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98881e72a882f2769566b88ffd6a4993cf398da0dad68b8463a0a32b2c51c629' 
  AND token = '8Us9/SEQFXz8QASOqu6St816OL6duEQTKrkUOAP84hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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