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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bb77ffd5a17b7427ac2b964da7c245270f63ad9397f14e214aaef05baff58bd' 
  AND token = 'gXsUTlnS42sCeBIptAFfu9tu72YBOaeKsRUA4W3znm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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