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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b998765e3b7f0d06784d81414fa6d000db1c49310e43b3238c46c4eae1ab943' 
  AND token = 'xEkR3/vwmTNPqEw9R5WqChw4UbTP3kwWMYljrbyQ+to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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