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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf43f6fe3f49b0175158890fa6314ad74423dcaf4573db83b69b82adeb2ddd5d' 
  AND token = '1nywPXk3ffuxn7v+G0CFyjNguejd3JCy/DIYZo7mW6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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