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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56370f2298f0f0dcbdf4f28467bbce2d0a3847c44943d7b1603a3a10f98000bb' 
  AND token = '5cb0P6efi3BpKBGhvH/XIMbwkN6b4Mp3SF85luzHos4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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