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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bda362b4b98599915202feb03fa745572296e6dbc984676a6461af9f57232b2' 
  AND token = '01fOS/g7cfWWjliqNuTKJPFF74NtgTq1R8B2OKtnabM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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