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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8cc243c3450074a5a5a06810407a05accc4308a14550ad9ca7903fc58a7e2cf' 
  AND token = 'XialBwln08DJ/tV1oBYYpWKGzEl29dy7g3itcV8n8jI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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