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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3544b49093f204aa0dcc31392b6e05dc7e945c5d5ab66144c3e5c17d69d73f47' 
  AND token = 'bFJftPMgf2GVPPdl/gi70TotD9PmzLjB32Oq0DQnal4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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