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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0acb632edfc9bcad062dbcd7dc634e449fd307a8234904a7d60e3eaa980fa2cf' 
  AND token = 'skcEZ/3APZuJZpRTADwdVbotaw5OpIhe6Uh060zoDhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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