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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e1957ab795a2c035af4f686392883d2a13e9c3449ae8552ece785581535835b' 
  AND token = '+MliCJGikPTJoHSLcRlVnBxQXHwWPBJJE06F8XR3wUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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