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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95c6a2f3d51bb71ac86feaa5c6fbb11ff825fdb9b74f06922b72010b2b68d94c' 
  AND token = 'w1lFzXLNzCT5SPQd2ZvpFt2Km+nMiJiSrQLpQUA5IyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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