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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c8bd3163b676e994f23408f4fc112279c6a215869d79a6aaaeb3518fc560f59' 
  AND token = 'FIZkuMtJozfW7n9r61gdOjLrRqmy7tYBMBwt6aSETYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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