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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aabafa3ed19429604f32d8682f97c8e6b30a6da6dde614a91f8144f1d2ec852' 
  AND token = '/T0AwoD+bX9SqV/i+QmdCaEzZWlYk/ryrXSQq51UjUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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