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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc1edb7e8ccd6b581e791a0b39b2b1185c719099f0114303690cbf2537cf3d80' 
  AND token = 'wlhYwOQ5UJjHBZCUo94RLplcX3gj9qCOEJoUZbAnTkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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