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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '821beeea03d06a780b48b5db9e3c12ad3337a59cf76aca42df995cb5a03583d8' 
  AND token = 'v0VNk6RcutkDmlaVTfU/0HhrxEz0W5TMZzhexgt1KB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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