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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '838da5514e6d9c124b0938e1071d45e189371d5833eff644c5a2df1b1a5edaac' 
  AND token = 'FSB3iR2YWdOmYboEyXD+ul5fP4PDn3RJxuUMdH2ay00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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