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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b32095e94900f14a01ab435fc9c7b557710adcffe36923f3bb3b73187c632c7' 
  AND token = 'Bu/m62ak3aodpfFzwDyS4J4axnxmYUb+CCyC5TNLeDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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