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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b71a12a8e08a9370f571a0939c0ec0200a8d5eeea64f2188946669c3d24b506' 
  AND token = 'WwNZ+CIDY1b19yvjKRr+cuDS0AkkanbfhcRpNS6WfAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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