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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fb9f77c3dbefac516c9488794a27087af80c7e41a9db12d7888e4f411932d3e' 
  AND token = 'G/fxTBnExTO3Q49A5zrE0OKhtHtJ5xqhX10IXhY1XMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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