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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2fa06ad075396dd295095fad3dc480273836b1cc3f9fee96a1a3969b0f34dd9' 
  AND token = '30HLQ5QxDnR7wIT5eK4pZI0/XU7GMVyUiVBAJCPoFZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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