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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e24d0227ec99f981edb6d5245ddf9f030e1a895571b7dc52fb6adadb9c2e4148' 
  AND token = 'dMKGjxkUJ6wurQfeMjZsZjTuDmnwajiBm+g07SUIuUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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