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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd56714cf7e646455dedc03cf6266428fb71fcc5ecc3f7830a5218fd10a65d729' 
  AND token = '/DMj0Xqxr2ULJbhM+HmLsi92OATiPHLzoIBliedHJeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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