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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '856a36cbaa2b44b038816c116645e82ed3f8ef2a3f827e2be3aa6ebf2e6a719e' 
  AND token = '2JIhz8sf5EQb8yZ0OBXEXDwjO/j6O/ZIj077ECpOYwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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