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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa0ac4dd5d38eb0834857f3e39ac71899bbd57e3dedd38b833f3f146f81596a2' 
  AND token = 'aFVdhZVN2fIeugi3yFaPMcI9i0tL76kCt8kyKwy/NnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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