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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19229687c837abb2a0ae69a5ea6f4300424fb0d5b8f626513867a308639f1c71' 
  AND token = 'vxzpyHB+HboK10NHFEkF1bIGPyvm2S2u4+i+KcS2aqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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