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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59d61934711774df2ef571c67e9e25560ec60285302f67e58388c8a1bf1d0d85' 
  AND token = 'mEk0m0jTo8mjeBGJNTu1ObHS2MQebf3W4AZEkKdn9G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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