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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75dd7d7a8ccfeb538dde309ea11fa08a85adf6dbdd0d7531c86b4e80399976ca' 
  AND token = 'A/3V6EUKdU5v2QFEvQe+kQH+rnH5/aQGEyseY2t9d3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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