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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95866c6b7e0535c382b48f4af15c4688aec1579dddf2e1f17a4e04ef4d9722e0' 
  AND token = 'gUEf1kO84X1kf6KINlNionE06np3Mn9kuQQ+gAPbSFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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