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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e52f5e671dd299be872b13208f338c0e34f0a20ae3e1ebc386b93874944ff9d' 
  AND token = 'SoVcYzGigaJxPQMUUNms8NJp/eOLpYanA6lCeaGRT40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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