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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ab83c2603468dfa9a9b30181106615bf835f969d3502e78e664415f1ae5e41e' 
  AND token = 'gHcaiIN51cpC8d3ehXOpfY0aV0qSMinfD1AuV6kkzi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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