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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cf5ed746c7c6f96f9a963dbc50dc4b7a80b989dc5f46a975bb8b8546c31a130' 
  AND token = '/Ov4JfSPHXcaJ4gy3vPNBAL3Dk5bL7i1qew04wD3zk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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