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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '943d41952bc4701b3dfc5a5d54ba62effe2b4d323e4cc0d8b10185b5383e5b0e' 
  AND token = '+6mLLHvgqAbwFUxX6gts/Ap6rMw4KK/5eGLIClt7mnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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