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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '086b76bb96ba83ed85058a827e40ce62b9a148cf474d498ad3a284b3b02cf11c' 
  AND token = '+suqVf2LY+i5ddZyHA6c1CdLSX1IL+fGn/KnReL5Yts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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