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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cc11adff56f97a4449d463b972bc6127256b9e5bed835dfed33996e4b038012' 
  AND token = 'KqTo9bteDdC3tJJJ3Qac0NrxOrmMROE532Gue96N/fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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